Two countries were well positioned to colonize islands off the coast of Africa in the late 15th century. A series of treaties divided control of these new lands between Castile and Portugal, starting with the Treaty of Alcaçovas-Toledo in 1480 over the Canary Islands. Christopher Columbus, seeking to find a western route to Asia for Queen Isabella of Castile, instead discovered new lands across the Atlantic in 1493. This led to the Treaty of Tordesillas in 1494 and later the Treaty of Zaragoza in 1529, which divided territorial claims between the two countries.